Case mix index (CMI) is an indicator of hospital financial health. A high CMIimplies that a hospital performs more expensive inpatient procedures and receives a greater sum of money per patient.

A change in case mix can negatively impact hospital financial performance.One method to improve case mix is to improve physician documentation of patient comorbidities. If a hospital is treating patients with more complex comorbidities, the hospital can bill CMS differently and recover funds.

The average case mix of all listed hospitals is 2.66. Four COC hospitals with the highest case mix are in Texas (16 percent) and another four are in Ohio. This could be attributed to barriers to care access in more rural regionsof these states—and, therefore, higher concentrations of patients insured through Medicare and Medicaid.

Fig 1 Cancer center case mix index found using the hospital search function within Definitive Healthcare’sHospitals & IDNsplatform. Only Commission on Cancer (CoC) Centers are included in this list. Accessed March 19, 2020.